Issue 3, 2024

Ion conduction and phase behaviour in dual cation polyelectrolyte blends for sodium-ion batteries

Abstract

Emerging battery technologies such as solid-state sodium batteries can benefit from new polymer electrolytes with improved sodium ion transport to optimise electrochemical performance. In this work, we propose, for the first time, the use of polyelectrolyte blends utilising a dual cation approach with a common polyanion backbone, poly(1-[3-(methacryloyloxy)propylsulfonyl]-1-(trifluoromethanesulfonyl)imide) (polyMTFSI). Thus, three new anionic polyelectrolytes were synthesised based on polyMTFSI having three different counter cations such as sodium (Na) (polyMTFSI-Na), trimethyl(isobutyl)phosphonium (poly-MTFSIP111i4) and diethyl (isobutyl)(methyl)phosphonium (polyMTFSI-P122i4). The miscibility between the polyelectrolytes in blends was determined by observing a single glass transition, Tg, for different compositions. Upon the addition of bulky organic cations, an increase in the dynamics and ionic conductivity was observed. Finally, we investigated the effect of NaFSI as an additional component in a ternary electrolyte system, whereby the salt acted as a plasticizer, decreasing Tg, and further enhancing the ionic conductivity.

Graphical abstract: Ion conduction and phase behaviour in dual cation polyelectrolyte blends for sodium-ion batteries

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Article information

Article type
Paper
Submitted
11 Nov. 2023
Accepted
25 Janv. 2024
First published
31 Janv. 2024
This article is Open Access
Creative Commons BY-NC license

RSC Appl. Polym., 2024,2, 384-394

Ion conduction and phase behaviour in dual cation polyelectrolyte blends for sodium-ion batteries

S. Malunavar, L. Porcarelli, P. C. Howlett, D. Mecerreyes and M. Forsyth, RSC Appl. Polym., 2024, 2, 384 DOI: 10.1039/D3LP00245D

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